基于重排序的迭代式实体对齐

Iterative Entity Alignment via Re-Ranking

现有的知识图谱无法避免地存在不完整这一问题.缓解此问题的可行方法是引入外部知识图谱中的知识.在此过程中,实体对齐是最关键的步骤.当前最先进的实体对齐解决方案主要依靠知识图谱的结构信息来判断实体的等价性,但在真实世界知识图谱上,大部分实体只具有较低的节点度数以及微少的结构信息.此外,标注数据的缺乏也大大限制了实体对齐模型的效果.为解决上述问题,提出将不受节点度数影响的实体名信息与结构信息相结合,从更全面的角度实现实体对齐.在此基本框架上,利用基于课程学习的迭代训练方法从易至难地选择高置信度结果加入到训练数据中,扩增标注数据的规模.最后使用词移距离模型进一步改进实体名信息的利用方式,并对前序对齐结果重排序,提升实体对齐准确率.在跨语言以及单语言实体对齐任务上的实验结果表明,提出的实体对齐方法性能远好于当前最好的方法.

Existing knowledge graphs(KGs)inevitably suffer from the problem of incompleteness.One feasible approach to tackle this issue is by introducing knowledge from other KGs.During the process of knowledge integration,entity alignment(EA),which aims to find equivalent entities in different KGs,is the most crucial step,as entities are the pivots that connect heterogeneous KGs.State-of-the-art EA solutions mainly rely on KG structure information for judging the equivalence of entities,whereas most entities in real-life KGs are in low degrees and contain limited structural information.Additionally,the lack of supervision signals also constrains the effectiveness of EA models.In order to tackle aforementioned issues,we propose to combine entity name information,which is not affected by entity degree,with structural information,to convey more comprehensive signals for aligning entities.Upon this basic EA framework,we further devise a curriculum learning based iterative training strategy to increase the scale of labelled data with confident EA pairs selected from the results of each round.Moreover,we exploit word mover's distance model to optimize the utilization of entity name information and re-rank alignment results,which in turn boosts the accuracy of EA.We evaluate our proposal on both cross-lingual and mono-lingual EA tasks against strong existing methods,and the experimental results reveal that our solution outperforms the state-of-the-arts by a large margin.